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I was doing one of those Sudoku puzzles the other day and thinking “It wouldn't be that hard to write some sort of Sudoku generator and solver in C#“

The freely available ones that I found usually use a clumsy “brute force” algorithm.

Brad Abrams has written a Sudoku solver here. 

I found another one here (not sure if source code is included).

Perhaps it could be a challenge for others to come up with the most elegant SuDoKu solver algorithm?

Mike Gold has written a Sudoku generator using Genome algorithms!  Here is his article.

If you just want to have a go at some of the puzzles http://www.websudoku.com/